Hydraulic lubricant dispenser



y 1932- J. R. LAssnER ET AL ,515

HYDRAULIC LUBRICANT DISPENSER T M f x0 Rfi f a W d @M b X a $2 a 72 3 o 3 o 0% M y 1932- J. R. LASSITER ET AL 1,867,515

HYDRAULIC LUBRICANT DISPENSER Filed May 20. 1931 2 Sheets-Sheet 2 47 5.5 47 gmwntom John R. Lssz'z r M4 Harry L, 170mm Patented July 12, 1932 UNITED STATES,

PATEN or icE JOHN R. LASSITER AND EARRY L. MonnIs, or NORFOLK, VIRGINIA HYDRAULIC LUBRICANT DISPENSER Application filed May 20, 1931. Serial No. 538,800..

7 This invention relates to hydraulic lubricant dispensing devices, and has for its general object the provision of an apparatus of the character described especially designed to be employed by service stationsand the like, for dispensing a particular grade of grease, v v

' mounted on a truck and trundled by means tenacious in character. Fluid pressure actuated grease dispensers are of course lmown, but insofar as applim cant-s are aware, such devices have invariably been designed for the filling or small cups, etc, with grease of non-tenacious property, conditions that call'for raising the pressure ratio of the grease relative to the applied pressure for operating the mechanism.

The present invention operates upon the opposite principle. and provides for the extrusion of a large volume of grease at a relatively low pressure.

While the invention is in the present specification contemplated in its relation to the automobile industry, it is to be understood that the apparatus is adapted-for general use. i

Other objects of the invention relate to improvements in the details of construction in the simplification of the mechanism and in the accessibility of the parts, all as will appear as the following description of a preferred and practical embodiment, of the invention proceeds.

In the drawings inthe several figures of which the same characters of reference have 55 been employed to designate identical parts; Figure 11s a vertical section through a grease dispenser embracing the principles of. thepresent invention; 7

Figure 2 is a section taken along the line 22 of Figure l; r

Figure 3 is a vertical sectionof a detail on an enlarged scale showing the-valve mechanism; V

V Figure 4c is a perspective view of the release valve;

Figure 5 is a view in elevation, showing in broken lines the grease plunger at the upper end of its stroke; Q

Figure 6 is a perspective view of the 1151- draulic plunger; and I i I the body l preferably axially of the chamber I 70 The upper end is" slightly reduced forming i I terior walls of the body 1. plungerrod12 reciprocates within the cylinthe lubricant'is to be supplied.

Figure 7 is a fraglnentarydetail in elevation of the operating mechanism.

Referring now in detail to the severalifig- I ures, and first adverting to Figure 1, the'numeral 1 represents a cylindrical bodysuitably secured to a base 2. The base 2 ,may be of a handle 3 at the upper end ofthe apparatus, which handle is the means by which the V filler cap 4. is removed. The cylindrical chamber withinthe body 1.;is segregated by meansfot the'fhead' 5 into an upper or grease chamber and a lower chamber 6 for the hydraulic Ifluid which'in'this instance may be glycerin'e although'the use of any of'a full range of equivalent transmission fluids is contemplated. e I

A hydraulic cylinder 'l is placed within 6 and secured, at its lower end tothe base 2.

a shoulder 8 upon which the head5 rests.

.Said head comprises a plate 8, a cup leather or its equivalent 9 and affollow er 10. A nut. 11 compresses these members, forcing the cup leather into sealingcontact with the in- A hydraulic der'7 having a plunger at, its lower 'e'nd coma prising asis shown in Figure 3, a plate 13,

cup leather 14 and. follower 15. A nut 16 holds these parts together and in compressive relation, forcing the cup leather 14' into seal-' ing conta'ctwith the'interior wall of the cyl inder 7. The grease plunger which in gen- 5 eral-is designatedby the reference character 17 is carried at the upper end of, the by,

draulic plunger rod 12, saidgrease plunger comprising a plate-18, cup leather 19. and follower 20, all compressed together by means of the nut 21. 1 V

A stufiing box 22 surrounds the plunger rod at the upper end of the head 5 and prevents anyglycerine which may leak'past the. hydraulic plunger getting into the grease chamber. The latter chamber is provided with an outlet fitting 23 having a hose connec tion 24 terminating in a suitable nipple 25.

adapted to be connected to the part to whichd The base 2 is cored out at 26 to form a pump chamber having pump inlet and outlet valves 27 and28respectively. Theinletvalve27communicates by way of a fitting 29 and strainer 30 with the glycerine chamber 6. The base 2 is provided with a bore 31 communicating with a passage 32 leading to the lower end of the hydraulic cylinder 7, beneath the hydraulic plunger. The base is cored out on its opposite side as indicated at 32" forming a passage which communicates by way of a bore 33 with the glycerine chamber. Bushings 34 and 35 are arranged inopposite ends of the bore 31 and a 'release'valve 36 seats against the inner end of thebushing 34. The

pump outlet valve 28 seats in similarmanner against the lOllSllIIlg 35 and Ya spring 37 1s compressed between said valves normally holding both of them to their seats. The pump outlet valve is of course, unseated against the tension of said spring by pres-- sure from within the pump. The release Valve 36 is :actuated by a stem/38 extending through the bushing 34 and terminating loosely against the .releasevalve. A fitting .39 is bolted or otherwisesuitabl-y secured to the base 2, in whichis journaled an oscillating shaft 40 operated bya foot pedal 41, see Figure 2, and returned by a-spring 42acting against the under sideof said pedal. The

shaft has an inclined cam end 44 acting against a similarly shaped cam 43at the end of the fitting 39; Aspring46 normally holds the push rod out of contact with the-stem 38. a When the foot'pedal is depressed, the cam faces ride uponpone another forcing the pushrod inwardly against the stem 38 which in turn presses against the release valve torcing it from its seat against the' tension of v.the spring 37. 1

A fitting 47 is bolted orotherwise secured to the base 2, closing the open side of the pump chamber 26. Said fitting hasa .pump cylinder 48 and atpump plunger49. Thepump chamber communicates with "the cylinder 48 "byl neans of a passage 50. The pump plunger 1S operated in any sultable manner, one means being illustrated 111 Figure? 1n which a link'51 is pivot-ally secu-redto the base as at 52 and at its upper .end it is pivotally con nectedto a lever 53. The pump plunger is .pivoted to the lever 53 at an'intermediate point of said lever; The .farend of said lever is connected by means of a link 54 with the lever 55, oneendv ofwhich is 'pivotally mounted upon the base as shownat 56, and the other end of whichcarriesthe footpedal 5'7. Upon pressing upon the 7 foot pedal, the plunger 49 descends. Upon releasing pressure on the foot pedal, the latter is returned to its original position by a spring 58.

In operation, successive strokes are imparted to the pump plunger 49, -the pump withdrawing glycerine from :the. glycerine chamber forcing it out through thebore '31 and passage 32 to the hydraulic cylinder. The plunger rod 12 is thus moved up and carries with it the grease plunger 17. In View of the difi'erence in areas of the hydraulic plunger and the grease plunger, the pressure ratio between the grease pressure and the hydraulic pressure is reduced. The grease is thus delivered in large volume but at a lower pressure than that required to operate grease plunger any higher.

If at any time it is desired to release pressure upon the hose 24, it is merely necessary to press momentarily upon the foot pedal 41. This opens the release valve 36 and permits the relief of pressure from the hydraulic cylinder.. In filling the grease dispenser, the handle 3 is turned so as to unscrew the cap 4. Pressure is thenapplied-and maintained on the .foot pedal a suflicient length oftime to pcrmit'the return of all of the glycerine in" the hydraulic cylinder back to the glycerine chamber under the descent of the hydraulic plunger, produced by pressing upon the grease plunger 'by means of a stick or any other suitable instrument inserted in the open endot the cylinder 1.- When the hydraulic .plunger has reached its lowermost position,

grease is supplied to the grease chamber manually.

In disassembling the apparatus for replac ing the cup leathers when necessary or for making such ad ustmentsas may be required to cure leakage, the grease plunger 17 as well as the head 5 are provided with eyes and 61 which may be engaged by hooked wires to permit the withdrawal of these members. The grease plunger may be Withdrawn after a socket wrench has been introduced and the .nut 21 removed. Access is thushad to the stufiing box 22 which may be tightened by a* suitable socket wrench. If the head 5 has to be removed, the nut 11 is first unscrewed and the head then drawn out through the body 1 by means of wires hooked into the eyes 61.

' Convenient access may be hadto any of the valves or appurtenant elements located in the base 2. For instance if it is desired to remove the pump inlet valve and strainer a plug 63 is provided, the removal of which gives access to the fitting 29 by a socket wrench. The

bushings 34 and 35 are in alinement, with the'cored out portions 26 and 32. By remov ingeither the fittings 39 or 47 access may be had. to either of the bushings 34 or 35 by means of a socket wrench. When either of these bushings is removed, the spring 28 and both the pump inlet and release valve may be taken out. I r r The body 1 is provided, between the head 5 and the grease plunger 17 with air relief ports 64 permitting air to escape when the grease plunger descends.

While it is obvious that a single inclined surface would act as a cam between the oscillating shaft 40 and the collar 44 by making the cam surfaces in the form of'teet-h as shown, a more abrupt sloping may be obtained and a quicker opening of the release valve thus accomplished.

While we have in the above description disclosed what we believe to be a preferred and practical embodiment of the invention, it is to be understood that the details of construction as shown are merely by way of example and are not to be considered limitative in their bearing upon the scope of the invention as claimed.

What we claim as our invention is:

1. Hydraulic viscous fluid dispenser comprising a base, inner and outer cylinders secured to said base, the inner cylinder terminating at an intermediate point within the outercylinder, head supported by said inner cylinder and fitting the outer cylinder in sealing relation defining a reservoir for the hydraulic transmission fluid within said outer cylinder between said head and base, plungers in said inner and outer cylinders unitarily related that part of the outer cylinder above the plunger of said outer cylinder constituting a reservoir for the viscous fluid to be dispensed, a pump, and a valve controlled inlet and outlet for said pump carried by said base and communicating with the chamber in the lower part of said outer cylinder and with the inner cylinder respectively.

2. Hydraulic viscous fluid dispenser comprising a base, inner and outer cylinders carried by said base, the inner cylinder terminatin g at a point intermediate the length of the outer cylinder, a head supported by said inner cylinder and fitting the outer cylinder in sealing relation, a plunger in said inner cylinder, a plunger in said outer cylinder above said head, a plunger rod connecting said plungers, that part of the outer cylinder above said base and below said head constituting a reservoir for the transmission fluid, a pump associated with said base, a valve controlled inlet and outlet for said pump nating at an intermediate point on the outer cylinder, an annular head supported by said inner cylinder and fitting the outer cylinder insealing relation, a plunger for said inner cylinder, 1a plunger Within said outer cylinder above said head, a common plunger rod unitarily connecting said plungers, the chamber within said outer cylinder above the plunger of said outer cylinder, constituting a reservoir for the viscous fluid to be dispensed, said base being cored out on opposite sides to form a pump chamber and a release chamber, said chambers communicating with the transmission fluid chamber, a pump cylinder, a plunger in said cylinder, a fitting removably secured to said base supporting said pump cylinder and having a passage connecting said cylinder to said pump chamber, a valve controlled inlet connecting said pump chamber with said transmission fluid chamber, an oscillatable shaft extending into said release chamber, a passage establlshing co nmunication between said pump chamber, said release chamber and the inner cylinder below said plunger, a pump, an outlet valve and a f' release valve in said last named passage,

.a common spring beneath said valve s nor mallyholding'them closed, and means operated by said shaft forv releasing said release valve when said shaft is oscillated to place the inner cylinder into communication with the transmission fluid reservoir, said pump. outlet and said release valves being in alinement, and accessible through portions of said base.

the cored out 4E. Hydraulic viscous fluid dispenser comprising a base, inner and outer casings secured to said base having cylindrical portions, the outer cylindrical portion constituting a rese ervoir'for the fluid tobe dispensed, a plunger in the cylindrical portion of each casing, said plungers being unitarily related, means applying pressure hydraulically to the outer plunger, the lower part of the outer casing constituting a reservoir for the hydraulic pressure transmitting fluid, and being entire- 7 ly separated from the reservoir for the fluid to be dispensed.

In testimony whereof we aflix our signa-V tures. r

JOHN R. LASSITER. HARRY L. ;MORRIS.

carried by said base communicating with the transmission fluid reservoir and with the inner cylinder, a release valve also carried by said base communicating with said inner cylinder and said transmission fluid reservoir, and means for operating said release valve.

3. Hydraulic viscous fluid dispenser comprising a base, inner and outer cylinders carried by said base, the inner cylinder termi- 

